JPH0663622A - Method for preventing plane bend of rolled stock and device therefor - Google Patents

Abstract

PURPOSE:To prevent camber which is plane bending of a rolled stock from being generated when rolling is executed by a line of mills provided with a horizontal mill and a vertical mill in the thickness direction and in the width direction. CONSTITUTION:An amount of bending in the width direction of the rolled stock 3 and its direction are detected by a camber meter 11 on the downstream side of the horizontal mill 1, gaps between both right and left end parts of working rolls (a) of the horizontal mill are adjusted and an amount of offset of the vertical mill is adjusted. Otherwise, an amount shifting the vertical rolls (c), (d) in the width direction is adjusted instead of adjusting the amount of offset of the vertical mill.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a row of rolling mills consisting of a horizontal rolling mill and a vertical rolling mill to perform widthwise rolling by a vertical rolling mill and rolling in the thickness direction by a horizontal rolling mill. Plane bending (camber) that occurs in the rolled material when performing
The present invention relates to a rolling method and an apparatus for preventing the rolling.

[0002]

2. Description of the Related Art A rolling mill train for performing this type of rolling is
For example, it is found in a rough rolling mill of hot rolling equipment, and its outline is shown in FIGS. 8 and 9. 8 is a plan view, and FIG. 9 is a side view. Reference numeral 1 is a horizontal rolling mill provided with a pair of upper and lower work rolls a and b, and 2 is an upstream side (left side in the drawing) of the horizontal rolling mill 1 in the rolling direction. In the vertical rolling mill provided in the above, the rolled material 3 is rolled in the width direction by the vertical rolls c and d, and then rolled in the thickness direction by the horizontal rolls a and b. The rolls b, c, and d are configured so that the rolling force can be adjusted by cylinders 4 and 5 which are rolling down devices.

In order to carry out so-called reverse rolling by reversing the rolling direction, there is also an example in which another vertical rolling mill 6 is symmetrically provided with the horizontal rolling mill 1 sandwiched as shown by the chain line in the figure. . In this case, in the case of rolling in the forward direction, vertical rolling is performed by the vertical rolling mill 2 so that the vertical rolls e and f of the vertical rolling mill 6 are rolled.
Are retracted, and when rolling in the reverse direction, a vertical rolling mill 6
By performing widthwise rolling with the vertical roll c of the vertical rolling mill 2,
d is evacuated.

[0004]

By the way, when rolling is carried out by the rolling mill train as described above, it is caused by a vertical rolling mill, by a horizontal rolling mill, or by various intricately entwined ones. For some reasons, the rolled material 3 may have a plane bend called a camber as shown in FIG. FIG. 10 is a top view of the rolled material, where W is the strip width, L is the rolled material length, and δ is the camber amount. In the case of FIG. 10, for example, it is said that the material having the entire length L has a camber of δ. When the camber as described above occurs, the side of the rolled material 3 must be trimmed to form a rectangular plate, which lowers the yield. In addition, the bent rolled material meanders when it is rolled by the rolling mill on the downstream side, which causes problems such as unstable operation. Therefore, it has been desired to provide an effective means for preventing the camber.

On the other hand, for example, in a rolling mill train in which a vertical rolling mill and a horizontal rolling mill are combined, the vertical roll on the delivery side of the horizontal rolling mill is shifted in the width direction and rolled to bend the rolled material. A rolling method for preventing this has been proposed in JP-A-57-39018. Further, one of the present inventors also proposed a vertical rolling mill for preventing meandering and camber by offsetting the vertical rolls of the vertical rolling mill arranged on the entrance side of the horizontal rolling mill in the rolling direction.
Proposed in Issue 5. However, in both cases, the vertical rolling mill is the only actuator that prevents meandering and camber,
The control range is narrow and the control capability is limited in terms of responsiveness.

The present invention has been made in view of these points.

[0007]

A method for preventing camber and an apparatus therefor according to the first and second aspects of the present invention include a horizontal rolling mill and a vertical rolling mill arranged upstream of the horizontal rolling mill in the rolling direction. Using, when rolling the rolled material in the width direction by the vertical rolling mill and then rolling in the thickness direction by the horizontal rolling mill, the bending amount in the width direction of the rolled material at the rolling direction downstream side of the horizontal rolling mill. And adjust the gap between the left and right ends of the work roll of the horizontal rolling mill based on the detection result, and at least one of the pair of vertical rolls of the vertical rolling mill is shifted in the rolling direction. It is characterized by adjusting the offset amount of those vertical rolls.

Further, in the method and apparatus for preventing camber according to the third and fourth aspects of the present invention, instead of adjusting the offset amount of the vertical rolls, both vertical rolls are kept at a constant mutual interval. It is characterized in that the side shift amount of those vertical rolls is adjusted by displacing the rolled material in the width direction.

[0009]

In the method and apparatus for preventing camber of the present invention, the amount of bending of the rolled material is detected on the downstream side of the horizontal rolling mill, and the work roll of the horizontal rolling mill is detected according to the degree and direction of the bending amount. By adjusting the gap between the left and right ends and the offset amount of the vertical roll or the side shift amount of the vertical roll of the vertical rolling mill, the camber of the rolled material is prevented. That is, if the gaps at the left and right ends of the work rolls of the horizontal rolling mill are made different so that one of the gaps is smaller than the other gap, the side with the smaller gap extends more than the side with the larger gap. Tries to bend to the side with the larger gap. Further, when the vertical rolls of the vertical rolling mill are offset, a bending moment acts on the rolled material, and when the vertical rolls are side-shifted in the width direction of the rolled material, a bending moment acts on the rolled material in the same manner. Therefore, when bending occurs, the left and right gaps of the work rolls of the horizontal rolling mill and the vertical roll offset amount, or the left and right gaps of the work rolls of the horizontal rolling mill and the vertical roll depending on the bending amount and the direction thereof. The camber can be prevented by simultaneously adjusting the side shift amount of the.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are explanatory views of the first embodiment.
1 is a plan view showing an outline of a rolling mill train for carrying out the rolling method of the first embodiment, FIG. 2 is a side view, and this rolling mill train is similar to the above-mentioned conventional one. A pair of work rolls a for rolling the rolled material 3 in the thickness direction,
b, and a pair of vertical rolls c, d provided on the upstream side in the rolling direction for rolling in the width direction.
The vertical rolling mill 2 is equipped with. In the horizontal rolling mill 1, cylinders 4 which are reduction devices are provided on the left and right of the work roll b, and the gaps at the left and right ends of the work rolls a and b can be adjusted. That is, it is possible not only to make the gap on the one side and the gap on the other side uniform, but also to make them different.

In the vertical rolling mill 2, the pair of left and right vertical rolls c and d are not only capable of adjusting the rolling force by the cylinders 5 and 5 which are rolling down devices, but are also movable by the offset cylinder 10 in the rolling direction. However, the offset amount of the vertical rolls c and d, that is, the shift amount of both vertical rolls 2 and 2 in the rolling direction can be adjusted.

Further, reference numeral 11 is a sensor (camber gauge) provided on the downstream side of the horizontal rolling mill 1 in order to detect the bending amount of the rolled material 3. The detection signal of the sensor 11 is input to the control device 12, which controls the sensor 11
A control signal is output to the cylinders 4 and 4 and the offset cylinders 10 and 10 based on the detection result, and the left and right gaps of the work rolls a and b and the vertical roll c,
It is configured to adjust the offset amount of d.

In order to perform rolling by the rolling mill train having the above-described structure, rolling is performed while detecting the bending of the rolled material 3 by the sensor 11 on the downstream side of the horizontal rolling mill 1, and when the bending is detected, the amount of bending is detected. By controlling the cylinders 4 and 4 of the work roll b of the horizontal rolling mill 1 and the offset cylinders 10 and 10 of the vertical rolls c and d of the work roll a of the horizontal rolling mill 1, the work rolls a and b of the horizontal rolling mill 1 are controlled. The gaps at the left and right ends of the vertical rolling mill 2 and the offset amounts of the vertical rolls c and d of the vertical rolling mill 2 are adjusted to prevent the rolled material 3 from cambering.

That is, the work roll a of the horizontal rolling mill 1,
If the gaps at the left and right ends of b are made different so that one gap is smaller than the other gap, the side with the smaller gap will extend more than the side with the larger gap. Can bend and thereby correct the bend. Further, when the vertical rolls c and d of the vertical rolling mill 2 are offset, the rolled material 3
Since a bending moment acts on, the meandering of the rolled material 3 can be corrected also by the moment.

For example, as shown in FIG. 3, when the rolled material 3 is bent to the right of the rolling direction on the exit side of the horizontal rolling mill 1, the sensor 11 detects the bending amount and the bending direction, and the signal Is sent to the controller 12. Controller 12
Then, depending on the bending amount and the bending direction, the change amount of the left and right roll gaps of the work rolls a and b of the horizontal rolling mill 1 and the offset change amount of the vertical rolls c and d of the vertical rolling mill 2 may interfere with each other. Calculated in consideration. Based on the result calculated by the controller 12, the cylinders 4 and 4 are controlled so that the gap on the right end side of the work rolls a and b of the horizontal rolling mill 1 becomes smaller than the gap on the left end side. ,
As a result, the right side edge of the rolled material 3 is rolled so as to be thinner than the left side edge and greatly stretched, whereby the bending is corrected.

At the same time, the vertical rolls c and d are offset so that the left vertical roll c is located ahead of the right vertical roll d. As a result, a clockwise bending moment acts on the rolled material 3, and as a result, a tension distribution as shown in the drawing is generated in the rolled material 3 on the entry side of the horizontal rolling mill 1. This is fed back to the left and right leveling of the horizontal rolling mill 1, and the camber is also corrected by this. Specifically, when the tension distribution as shown in the drawing occurs in the rolled material 3 on the entry side of the horizontal rolling mill 1, a tensile force acts on the rolled material on the right side in the traveling direction of the rolled material 3 and a compressive force acts on the left side. The right and left roll gaps of the horizontal rolling mill 1 tend to be narrower on the right side than on the left side. As a result, the camber can be corrected similarly to the case where the roll gap of the horizontal rolling mill 1 is adjusted. As described above, by optimally setting the left and right gaps of the work rolls a and b of the horizontal rolling mill 1 and the offset amounts of the vertical rolls c and d of the vertical rolling mill 2, the occurrence of the camber of the rolled material 3 is prevented. It can be prevented.
Further, the change amounts of both are adaptively set and calculated in consideration of the material of the rolled material 3, the rolling conditions, and the like.

The first embodiment has been described above. Next, referring to FIG.
The second embodiment will be described with reference to FIGS. In the first embodiment, the work rolls a, b of the horizontal rolling mill 1 are used.
Adjustment of the left and right gaps and vertical roll c of the vertical rolling mill 2,
Although the camber is eliminated by adjusting the offset amount of d, in the second embodiment, the vertical roll c,
The camber is eliminated by performing a side shift instead of the offset of d.

That is, when the sensor 11 detects a camber, the controller 12 controls the cylinders 4 and 4 to adjust the left and right gaps of the work rolls a and b of the horizontal rolling mill 1 and the vertical rolling mill 2 The vertical rolls c and d of the vertical rolls c and d are controlled by controlling the cylinders 5 and 5 which are reduction devices for the vertical rolls c and d.
Are shifted in the width direction of the rolled material 3 while keeping their mutual spacing constant. Thus, for example, when the rolled material 3 is bent to the right side with respect to the rolling direction on the exit side of the horizontal rolling mill 1 as shown in FIG. 6, the work of the horizontal rolling mill 1 is performed as in the case of the first embodiment. The cylinders 4 and 4 are controlled so that the gap on the right end side of the rolls a and b is smaller than the gap on the left end side, and the vertical rolls c and d of the vertical rolling mill 2 are moved in the rolling direction as shown by the chain line. On the other hand, it is moved to the left side (side shift), so that the tension distribution as shown in FIG.
Occurs in the width direction, and the camber is prevented for the reason described in the first embodiment.

The vertical rolls c and d may be offset and side-shifted at the same time. Further, in order to prevent the rolled material 3 from shifting in the width direction, a side guide 21 driven by a cylinder 20 may be attached to each of the above rolling mills, as shown in FIG. 7, for example. Further, when the method of the present invention is carried out by a rolling mill that performs reverse rolling, similar vertical rolling mills 2 and sensors 11 are provided symmetrically on both sides of the horizontal rolling mill 1 in accordance with the rolling direction. Either one of them may be selectively used.

Further, the example of the horizontal type rolling mill having a pair of work rolls is shown, but a quadruple type rolling mill having a retaining roll supporting the work rolls may be used. It goes without saying that various modifications can be made without departing from the gist of the present invention, such as the fact that one rolling mill may be incorporated into the housing of FIG. Further, in both the horizontal rolling mill and the vertical rolling mill, the example in which the rolling device is a fluid drive using a cylinder is shown, but it goes without saying that it may be an electric type in which a screw is driven by an electric motor or a combination of both.

[0021]

As described above, the method and apparatus for preventing camber according to the first and second aspects of the present invention detect the camber on the downstream side of the horizontal rolling mill, and depending on the degree and direction of the camber. The gap between the left and right ends of the work roll of the horizontal rolling mill and the offset amount of the vertical roll of the vertical rolling mill are adjusted, and the method and apparatus for preventing camber according to the invention of claims 3 and 4 are provided. Since the side shift amount is adjusted instead of adjusting the offset amount, both of them have an effect that the camber of the rolled material can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a method for preventing a camber and a device therefor according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view showing a state where the camber is corrected by the same method.

FIG. 4 is a plan view showing an outline of a method for preventing a camber and an apparatus therefor according to a second embodiment of the present invention.

FIG. 5 is a side view of the same.

FIG. 6 is a plan view showing a state where the camber is corrected by the same method.

FIG. 7 is a plan view showing another example of a camber prevention method and apparatus of the present invention.

FIG. 8 is a plan view showing a schematic configuration of a conventional rolling mill train.

FIG. 9 is a side view of the rolling mill train.

FIG. 10 is an explanatory diagram of a camber generated in a rolled material.

[Explanation of symbols]

 1 Horizontal rolling mill 2 Vertical rolling mill 3 Rolled material 4,5 Cylinder (roll down device) 10 Offset cylinder 11 Sensor (camber gauge) 12 Control device a, b Work rolls c, d, e, f Vertical roll δ Bending amount ( Amount of camber).

Front page continuation (72) Inventor Hiroaki Kuwano No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries, Ltd. Yokohama second factory (72) Inventor Katsumi Okada Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Address Ishi Kawashima Harima Heavy Industries Co., Ltd.Yokohama No.2 Factory (72) Inventor Takeshi Fujitsu 1-chome Mizushima Kawasaki Dori, Kurashiki City, Okayama Prefecture Kawasaki Steel Co., Ltd. 1-chome Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Takaro Iguchi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division

Claims (4)

[Claims] 1. A horizontal rolling mill and a vertical rolling mill provided with a pair of left and right vertical rolls arranged on the upstream side of the horizontal rolling mill in the rolling direction are used to roll the rolled material by the vertical rolling mill. When rolling in the thickness direction by the horizontal rolling mill after rolling in the direction, the amount of bending in the width direction of the rolled material is detected on the downstream side in the rolling direction of the horizontal rolling mill, and based on the detection result, the horizontal While adjusting the gap between the left and right ends of the work rolls of the rolling mill, the offset amount of the vertical rolls is adjusted by shifting at least one of the pair of vertical rolls of the vertical rolling mill in the rolling direction. Method for preventing flat bending of rolled material. 2. A horizontal rolling mill provided with a rolling-down device for adjusting the roll gap of the work rolls, and a device provided on the upstream side of the horizontal rolling mill in the rolling direction and for offsetting the left and right vertical rolls in the rolling direction. A vertical rolling mill and a camber gauge for detecting the bending amount and direction of the rolled material on the exit side of the horizontal rolling mill are provided, and based on the signal of the camber gauge, it is necessary to correct the bending amount of the rolled material. The amount of change of the left and right gaps between the work rolls of the horizontal rolling mill and the offset amount of the vertical rolls are calculated, and based on the calculation result, the reduction device of the horizontal rolling mill and the vertical roll offset device of the vertical rolling mill are used. A plane bending prevention device for a rolled material, comprising: a control device for sending a command. 3. A horizontal rolling mill and a vertical rolling mill provided with a pair of left and right vertical rolls arranged on the upstream side in the rolling direction of the horizontal rolling mill are used to roll the rolled material by the vertical rolling mill. When rolling in the thickness direction by the horizontal rolling mill after rolling in the direction, the amount of bending in the width direction of the rolled material is detected on the downstream side in the rolling direction of the horizontal rolling mill, and based on the detection result, the horizontal While adjusting the gap between the left and right ends of the work rolls of the rolling mill, the pair of vertical rolls of the vertical rolling mill are both vertically moved by shifting them in the width direction of the rolled material while keeping their mutual intervals constant. A method for preventing flat bending of a rolled material, which comprises adjusting the side shift amount of a roll. 4. A horizontal rolling mill provided with a rolling-down device for adjusting the roll gap of the work rolls, and a rolling-down device provided on the upstream side in the rolling direction of the horizontal rolling mill for adjusting the distance between the left and right vertical rolls. A vertical rolling mill and a camber gauge for detecting the bending amount and direction of the rolled material on the exit side of the horizontal rolling mill are provided, and based on the signal of the camber gauge, it is necessary to correct the bending amount of the rolled material. The amount of change in the left and right gaps between the work rolls of the horizontal rolling mill and the amount of shift in the plate width direction of the vertical rolls are calculated, and based on the calculation result, the reduction device of the horizontal rolling mill and the reduction of the vertical rolling mill are performed. An apparatus for preventing plane bending of a rolled material, comprising: a device and a control device for sending a command to the device.